FrameworkSetup: catch all exceptions in threads

FrameworkSetup: catch all exceptions in threads

Any uncaught exception in a thread running setup_node or cleanup_node
will prevent the result of that thread's execution from being passed
to the main thread. Since the main thread assumes there will be a result
for each thread, this leads to false positives. Catch all exceptions
in those background threads to fix this.

Change-Id: I64013dfc671e576290c8376a58c754ed21b9ba3e
Signed-off-by: Juraj Linkeš <juraj.linkes@pantheon.tech>